Westermo GS-01 - Manual (Page 25)

25 6195-2201
Data commands
+CBST – Bearer type selection
Command syntax: AT+CBST= , ,
No data compression is provided and only asynchronous modem is supported ( = 0).
Description Modem type
0 (default) Autobauding None
1 300 bit/s V.21
2 1 200 bit/s V.22
3 1 200/75 bit/s V.23
4 2 400 bit/s V.22bis
5 2 400 bit/s V.26ter
6 4 800 bit/s V.32
7 9 600 bit/s V.32
8 Specific
65 300 bit/s V.110
66 1 200 bit/s V.110
68 2 400 bit/s V.110
70 4 800 bit/s V.110
71 9 600 bit/s V.110
Connection element
0 Transparent only
1(default) Non transparent only
2 Transparent preferred
3 Non transparent preferred
Application to GSM AT+CBST=7,0,1 Ask for a bearer
GSM to application OK Bearer supported
Application to GSM AT+CBST=81,0,0 Ask for a bearer
GSM to application +CME ERROR: 4 Bearer not supported
This command applies to both outgoing and incoming data calls but in a different way.
For outgoing call the two parameters (e.g. and ) apply, whereas for
incoming call only the parameter applies.
Note 1) as far as incoming calls are concerned, if is set to T only and the network
proposes NT only or vice versa then the call is released.
Note 2) older values 100 and 101 for are retained for compatibility purpose but shall
not be used anymore, values 2 and 3 shall be used instead.